Jehangiri, Attique-ur-Rehman, et al. “CAUSES OF LOWER GASTROINTESTINAL BLEEDING ON COLONOSCOPY”. Journal of Ayub Medical College Abbottabad, vol. 29, no. 3, July 2017, pp. 468-71, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1324.